it could be that the player you're using cant support the headphones because the power needed for the 'phones isnt given in enough quantity by the player.
Try another pair of headphones you have laying around or ask a friend.
If they dont give you any problem, my solution is your best bet.
I just got an 80gb archos 705, and when i use the headphones that they give me, it works fine, but when i use my Bose qc3s in it i hear static in the background when a song or movie is playing, and when i turn down the volume the static stays, but the song gets quieter. i don't have wifi enabled, so i don't know what the problem could be.
has anyone else ever had this problem, or does anyone know how to fix it?